tests/fault_handler: Suppress cppcheck errors
tests/fault_handler: Suppress cppcheck errors

This code is supposed to hit the null pointer.

tests/fault_handler/main.c:43: error (nullPointer): Null pointer dereference: (volatile unsigned int*)(0x00000000u)
tests/fault_handler/main.c:44: error (nullPointer): Null pointer dereference: (volatile unsigned int*)(0x00000000u)

ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,kaspar030/RIOT,kYc0o/RIOT,kaspar030/RIOT,miri64/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,ant9000/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,miri64/RIOT,ant9000/RIOT,kaspar030/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,ant9000/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kaspar030/RIOT,kaspar030/RIOT,jasonatran/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,OlegHahm/RIOT